Hi @oguerra1,
Give a try to this:

Expression: replace(last(split(last(outputs('SplitintoLines')), 'url=')), ']','')
Explanation:
- last(outputs('SplitintoLines'), takes last line from SplitIntoLines compose outputs
- surrounding split(), splits line by 'url=' which returns an array containing both URL starting with https
- surrounding last(), take the URL we want to extract
- surrounding replace(), removes last ']' char
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